Hydraulic test system mounted with borehole television set for simultaneous observation in front and lateral directions

Abstract

The present invention provides a hydraulic test system, by which it is possible to select a proper position and to select a reliable measurement interval corresponding to said position, to obtain information for preventing retention or leaving of the equipment in the borehole, and to observe the conditions in front and lateral directions by a single BTV at the same time and at wide angle of view without adjusting focal point. On the tip of a measurement pipe to be inserted into a borehole, a waterproofing cylinder with a transparent window oriented for simultaneously observing in both the front and lateral directions is mounted, and there are provided illumination units for illuminating in front direction and side walls and a borehole television set equipped with a ball lens, spherical mirror lens or matched convex pair of lens system in said cylinder, which forms a virtual image of an object in front direction and a reflected virtual image of an object in lateral direction on almost the same plane.

What we claim are: 
     
       1. A hydraulic test system having a simultaneous observation type borehole television set for observing in front and lateral directions at the same time, comprising: a downhole unit including a borehole television set ("BTV"), having a television camera, mounted on the tip of a hollow measurement pipe inserted into a borehole, and outer packers for selecting a measurement interval by means of expansion, and provided with functions to perform hydraulic test;   a relay unit having at least an inner probe to play supplementary role in hydraulic testing operations and borehole viewing support functions such as water pressure measurement in hydraulic test for the selected measurement interval, a cable for transmitting and receiving signals for power supply, control and observation to and from the downhole unit, and said relay unit having pipes for supplying and discharging water; and   a surface unit having a control unit for controlling hydraulic testing functions and BTV in the downhole unit, a data processing unit for recording and analyzing measured or observed data, and cable drum units for said cable and said inner probe.   
     
     
       2. A hydraulic test system according to claim 1, wherein said BTV has an image forming optical system, and illumination units arranged near said image forming optical system and used for illuminating in front direction and side wall, said television camera being placed on the same optical axis as that of the image forming optical system, and said image forming optical system, said illumination units, and said television camera being placed in a waterproofing cylinder with a transparent window for observing in front direction and side wall of the borehole. 
     
     
       3. A hydraulic test system according to claim 2, wherein said image forming optical system comprises a spherical mirror, and focal point of a front lens unit of the spherical mirror is inside the focal point of a rear lens unit of the spherical mirror. 
     
     
       4. A hydraulic test system according to claim 2, wherein said image forming optical system comprises a biconvex lens having spherical convex surface and short focal length with a spacer placed therebetween, an inverted virtual image of an object in front direction is formed inside the lens, and a virtual image of an object in lateral direction is formed by the spherical convex surface of a rear convex lens on or near a plane where said inverted virtual image is formed. 
     
     
       5. A hydraulic test system according to claim 2, wherein said image forming optical system comprises a front semi-convex lens and a rear semi-convex lens having short focal lengths with convex surfaces of the two lenses facing in opposite directions, the distance between the lenses being made adjustable, an inverted virtual image of an object in front direction is formed inside the focal point of the rear semi-convex lens, and a virtual image of an object in lateral direction is formed by the spherical convex surface of the rear semi-convex lens on or near a plane where said inverted virtual image is formed. 
     
     
       6. A hydraulic test system according to claim 2, wherein said image forming optical system comprises a front semi-convex lens and a rear semi-convex lens having short focal lengths with convex surfaces of the two lenses placed face-to-face to each other, the distance between the two lenses being made adjustable, rear surface of the rear semi-convex lens is formed in spherical convex surface, a transparent body in form of a concave lens and engageable with the spherical convex surface is attached on it, an inverted virtual image of an object in front direction is formed inside the focal point of the rear semi-convex lens, and a virtual image of an object in lateral direction is formed by the spherical convex surface arranged on the rear surface of the rear semi-convex lens on or near a plane where said inverted virtual image is formed. 
     
     
       7. A hydraulic test system according to claim 2, wherein said image forming optical system comprises a concave lens having short focal length with a front end surface of a transparent cylinder block being formed as a concave mirror surface, a virtual image of an object in front direction is formed by the convex lens having short focal length, and a virtual image of an object in lateral direction is formed by the concave mirror surface on or near a plane where the virtual image of the object in front direction is formed.